The Plant Analysis Laboratory in the Department of Horticulture at Oregon State University is currently revising tissue standards and fertilizer recommendations for wine grapes. These revisions are the result of a research program that was sponsored by the Wine Advisory board beginning in 1985. We have utilized data collected during...
Revised May 1989. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Observations of annual growth and size and color of leaves and fruit are helpful in determining fertilizer needs. In addition, leaf analysis
indicates which elements are present in adequate, deficient, or excessive amounts. Soil analysis is useful in predicting the need for lime applications. Suspect a nutrient deficiency if poor...